[moniegail]

most of your carbs should definately come from veggies (atleast 12-15) the rest from cheese, sweetners or dressings, etc.

you'd have to eat an awful lot of those particular veggies(lettuce & cucumber) to get even close to the 20 gms of carbs each day. alot more than we're allotted.

however i did a little figuring on fitday and i hope this helps.

1c lettuce-1.6g
1c cucumber-2.6g
1/2c broccoli-2.9g
1/2c onion-7.5g
total carbs 14.6g minus fiber 4g for a net carb total of 10.6g

1c lettuce-1.6g
1/2c cucumber-1.3g
1/2c broccoli-2.9g
1/2c onion-7.5g
1/2c jicama-5.7g
total carbs 19g minus fiber 6.8 for a net carb total of 12.2g
(the examples above are just some of the veggies i use personally and not the only veggies allowed)

if you eat higher carb count veggies, then it's easier to get closer to 20g of carbs. personally, i average between 12g and 15g net carbs a day.
you say that you can only tolerate those two veggies, but there are so many on both lists to choose from maybe you could try a veggie that's new to you and you might be able to tolerate it.

anyway i hope this helps explain it better.

best wishes
moniegail